SPI A Word Scramble

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Question	Answer
According to ALARA which parameter should be minimized?
What is the result of an increase in the peak rarefactional pressure?
What does a hydrophone measrure?	acoustic output of an ultrasound image system
To what is penetration depth inversely related?
If an echo is recieved 25 microseconds after transmission, wha is the depth of the structure?
Besides a sound wave striking a boundary between two tissue interfaces at oblique incidence, which other condition must be present for refraction to occur?
Which artifact is produced by the reduction in echo signal amplitude deep to a strongly reflecting or attenuating structure?	refraction, enhancement, shadowing, reverberation
Which factor is most important when choosing the ultrasound exam?	cell size, impedance, depth, velocity
Which transducer array configuration results in a small footprint that is electronically steered and focused?	linear phased, linear sequential, annular, curved linear
What is increased if pulse duration is decreased?	bandwidth, line density, frame rate, duty factor
In an unfocused transucer, what is the region between the transducer face and the point where the beam diverges?	side lobe, focal zone, near zone, far field
Which factor causes lateral resolution to vary with depth?	beam width, pulse length, propagation speed, acoustic impedance
What is decreased with the nuber of acoustic lines per frame is increased without changing the max depth?	SPL, frame rate, PRF, receiver dynamic range
Which artifact is indicated by the arrows? pic	comet tail, shadow produced by diaphragm, mirror image, acoustic enhancement
What does read zoom do?	rescan region of interest, discard initial data obtained during scanning, increase number of scan line in ROI
What does frequency compounding improve?	temporal resolution, contrast resolution, elevational resolution, lateral resolution
What may cause point reflections to appear as horizontal lines rather than dots on the B-mode image?	propagation velocity, beam widthm transducer bandwidthm attenuation
How does adjusting the overall gain change the brightness of image?	adjust strength of transmitted soundpulse, adjust amplification of receive voltage, changes dynamic range, adjust ampliturde with depth
What is round trip time in soft tissue for an echo from a reflection depth of 1 cm?	1.54 m us, 6.5 m/s, 13 m/s, 26 m/s
What is the effect on PRP if PRF is doubled?	quartered, halfed, doubled, unchaged
What does coded excitation improve in addition to penetration?	lateral resolution, signal-to-noise ratio, frame rate, dynamic range
An increased in which parameter will improve accuracy of velocity measurement with autocorrelation?	color field of view, packet size, wall filter setting, transmitted frequency
Assuming PRF cannot be futher increased, what would mimimizee the observed artifact?	adjust sweep speed, adjust baseline, increase dynamic range, increased transmitted frequency
The reflections are moving at the same speed in the direction shown. For which reflection will the frequency of the received echo be the highest?	a,b,c,d
If the Doppler shift frequency is 1KHz when a vessel is 2 cm depth, what is the frequency shift at 4cm?	0.5KHz, 1 KHz, 1.5KHz, 2 KHz
What does the color image flow demonstrate? pic	gain set too high, velocity scale too low, packet size too large, transmitt frequency too high
Which signals are eleminated by wall filter in spectral Doppler display?	low frequency, low intensity, high frequency, high intensity
Which parameter would change on the phantom test if the SPL were made longer?	axial resolution, lateral resolution, horizontal distance registration, sensitivity
Which group is used to evaluate dead zone? pic	a,b,c,d
What is demonstrated in the is image from a linear array scanhead being placed on a uniform mimicking phantom? pic	TGC not set properly, system ??, focus control malformation, transducer damged

Created by: CJcards